"Doesn't get it" isn't always (or even usually) the problem, though. It's more "wasn't listening" or "didn't have time to comprehend what you meant (or the implications of what you meant) before the conversation moved on."
The biggest component of success in communication comes down to saying things enough times that your message can actually be listened to and digested at least once. You can vary the way you say things each time, but literal repetition works nearly as well, because the problem is almost never "I don't know what those words in that order mean" but rather "I didn't hear half that sentence" or "I was thinking about lunch" or "that might have been important but it just sort of passed by and I forgot."
The biggest component of success in communication comes down to saying things enough times that your message can actually be listened to and digested at least once. You can vary the way you say things each time, but literal repetition works nearly as well, because the problem is almost never "I don't know what those words in that order mean" but rather "I didn't hear half that sentence" or "I was thinking about lunch" or "that might have been important but it just sort of passed by and I forgot."